Re: [boost] Optimized portable isnan, isfinite, fpclassify etc

From: Johan Råde (rade_at_[hidden])
Date: 2006-10-12 11:39:31

John Maddock wrote:
> Johan Råde wrote:
>> 3. Your <limits> header is a bit funny.
>> numeric_limits<T>::quiet_NaN() returns a NaN with the signbit set.
>> This triggered the assertion.
> 
> You need to allow for the possibility that the sign bit is set anyway.

I will.

> 
>> (Does it matter? Maybe. According to C99, positive NaN should be
>> written to text files as "nan" or "+nan"  and negative NaN as "-nan".
>> And this will probably be part of C++0x as well.)
> 
> C++ doesn't guarentee any particular format for printing NaN's or Infinities 
> :-(

C99 does. And C99 will become part of C++0X, right?

--Johan